It's hard to get out of the barrel. It's slippery around the edges and people are happy to see you fall back in. Robert Downey, Jr.
Of all the arguments against voluntary euthanasia, the most influential is the 'slippery slope': once we allow doctors to kill patients, we will not be able to limit the killing to those who want to die. Peter Singer
Ideas are elusive, slippery things. Best to keep a pad of paper and a pencil at your bedside, so you can stab them during the night before they get away. Earl Nightingale
Beauty, like ice, our footing does betray; Who can tread sure on the smooth, slippery way: Pleased with the surface, we glide swiftly on, And see the dangers that we cannot shun. John Dryden
Grief and memory go together. After someone dies, that's what you're left with. And the memories are so slippery yet so rich. Mike Mills